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Ajax - The core of WordPress uses Ajax only in the administration screens. For instance, Ajax is used for instant updates when you are doing comment moderation, and when you are adding and deleting items from lists such as categories, blogroll, and posts; Ajax is also the technology behind the auto-save functionality on post and page editing screens. Several themes and plugins also use Ajax; for instance, some post rating plugins.

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call_user_func_array() expects parameter 1 to be a valid callback, class 'WC_Rapyd' does not...

We've installed the Woocommerce Rapyd Payments plugin and have the issue that the payment option is not loading on the front end. Query Monitor is showing the above warning message, but I haven't been …
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